Published online by Cambridge University Press: 01 May 2009
This important Coal-measure zonal Lamellibranch has already been recorded from the Yorkshire and Nottingham Coalfield (Cadeby and Gedling Colliery respectively), the Lancashire Coal-field (Ardwick, Manchester), the North Staffordshire Coalfield generally, the Forest of Dean and Bristol Coalfields, the South Wales Coalfield; and in all these widely separated districts it is found at the top of that portion of the Coal-measures characterised by the presence of the most valuable seams of coal.
page 506 note 1 Wheelton Hind: Quart. Journ. Geol. Soc., vol. lv, pp. 367–8.
page 506 note 2 James V. Kirkby: Trans. Tyneside Nat. Field Club, vol. vi, pp. 220–225.